Vibratory screen



Dec. 11, 1928. 1,694,565

l... E. SOLDAN ET AL VIBRATORY SCREEN Filed April 6, 1925 INVENT R.

BY fiarizgg ATTORNEY.

Patented Dec. 11, 1928.

UNITED STATES PATENT OFFICE.

LEWIS SOLDAN AND GEORGE W BEHNKE, 0F GLADWIN, MICHIGAN, ASSIGNORS T0 SIMI'LICITY ENGINEERING COMPANY, A. CORPORATION TO BE FORMED WITH 0]?- FICES AT DURAND, MICHIGAN.

VIBRATORY SCREEN.

This invention relates to shaker or vibratory screens and the like.

One object of the invention is to provide simple and substantial means whereby the screen is automatically crowned both transversely and longitudinally, and thereby eliminating the so called flutter or whipping which usually occurs when a flat screen is vibrated in the screening of gravel and various other products- Another object is to provide simple and improved means for flexibly hanging or connecting the upper end of the screen to the frame of the supporting mechanism.

A further object is to provide a three point suspension or mounting so that the screen frame will not be subjected to tortional twists or strains, etc.

A. further object still is to provide a screen, for screening sand, gravel, coal and other fragmentary materials of either a wet or dry classification.

The above and other objects will appear as the specification progresses, reference being had to the accompanying drawing in which like reference numerals indicate like parts throughout the several views thereof.

In the drawings:

Fig. 1 is a longitudinal sectional view taken on the line 11 of Fig. 2.

Fig. 2 is a top plan view of the screen.

Fig. 3 is a transverse sectional view and Fig. 4 is an enlarged side view of. one of the crowning bars.

Referring now particularly to the drawing, the numeral 1 indicates a rectangular frame preferably formed of piping, welded or otherwise secured together, and having upwardly extending side walls 2 secured thereto, the lower end of the frame having a pair of spaced apart clips 3 secured thereto, and which are provided with openings therein adapted to receive a bolt in the usual manner. The upper end of the frame is drilled to receive a bolt 4. for flexibly supporting and conmeeting the screen to a flexible bar 5, the ends of said bar being secured to a stationary frame 6 by means of screws 7.

A plurality of transversely disposed bars 8 connect the side members of the frame 1 and are secured thereto by means of clips 9, and

the upper edges of these bars are slightly bowed as shown in Fig. 4 of the drawing, so that when a screen is placed thereover it will be slightly crowned as illustrated in Fig. 3 of the drawing.

For bowing or crowning longitudinally, I prefer to make the center bar 8 of greater height than the others, making the next bar on either side a trifle shorter and graduating the height of the several bars from the center to both ends so that when the screen is placed thereon it will be crowned both in a transverse and longitudinal direction.

The screen proper which we have shown in the present instance is of the quickly detachable type, as the screens require fre uent changing when operating on certain inds of material, when said materials are in certain conditions. The means for this comprises a frame 10 which is superimposed on the frame 1, the upper end of both side members projecting beyond and being curved to engage and hook over the upper end of said frame for holding it in position.

Bolts 11 are provided for clamping the screen in position, the upper end 12 being hook shaped to engage the lower end or bar 13 of the frame 10, the lower ends of said bolts being threaded, and extending through the openings provided in the clips 3, and nuts 14 being threaded thereon, the tightening of these nuts servin to pull the frame and screen taut over the bars 8, thereby bowing or crowning the screen in both directions.

This construction and arrangement insures a long life for the screen as it eliminates the whip or flutter which quickly crystallizes the screen fabric and loosens the strands from each other.

We wish to direct particular attention to the mounting of the upper end of the screen, there being but one central connection or bolt 4, this bar is preferably of spring steel or other suitable metal and accurately synchronizes with the vibration roduced by the vibrating mechanism (nets own).

From the foregoing description it will be obvious that we have perfected a very simple, efiicient and substantial screen for screening fragmentary materials of either wet or dry classification.

What we claim is A vibratory screen comprising a substantially rectangular frame, spaced apart slightly crowned bars of graduated heights secured 5 therein, and a woven wire screen stretched thereover and secured to said frame, said bars being so arranged that the screen will be directions.

In testimony whereof We aifix our signa 10 tures.

, LEWIS E. SOLDAN.

GEORGE W. BEHNKE. 

